Annotation of src/usr.bin/ssh/ssh.c, Revision 1.259
1.1 deraadt 1: /*
1.32 deraadt 2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Ssh client program. This program can be used to log into a remote machine.
6: * The software supports strong authentication, encryption, and forwarding
7: * of X11, TCP/IP, and authentication connections.
8: *
1.64 deraadt 9: * As far as I am concerned, the code I have written for this software
10: * can be used freely for any purpose. Any derived versions of this
11: * software must be clearly marked as such, and if the derived work is
12: * incompatible with the protocol description in the RFC file, it must be
13: * called by a name other than "ssh" or "Secure Shell".
14: *
15: * Copyright (c) 1999 Niels Provos. All rights reserved.
1.202 markus 16: * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
1.64 deraadt 17: *
18: * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
19: * in Canada (German citizen).
20: *
21: * Redistribution and use in source and binary forms, with or without
22: * modification, are permitted provided that the following conditions
23: * are met:
24: * 1. Redistributions of source code must retain the above copyright
25: * notice, this list of conditions and the following disclaimer.
26: * 2. Redistributions in binary form must reproduce the above copyright
27: * notice, this list of conditions and the following disclaimer in the
28: * documentation and/or other materials provided with the distribution.
29: *
30: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 deraadt 40: */
1.1 deraadt 41:
42: #include "includes.h"
1.259 ! stevesk 43: RCSID("$OpenBSD: ssh.c,v 1.258 2006/02/08 12:15:27 stevesk Exp $");
! 44:
! 45: #include <sys/resource.h>
1.258 stevesk 46:
47: #include <paths.h>
1.49 markus 48:
49: #include <openssl/evp.h>
1.72 markus 50: #include <openssl/err.h>
1.1 deraadt 51:
1.84 markus 52: #include "ssh.h"
53: #include "ssh1.h"
54: #include "ssh2.h"
55: #include "compat.h"
56: #include "cipher.h"
1.1 deraadt 57: #include "xmalloc.h"
58: #include "packet.h"
59: #include "buffer.h"
1.214 djm 60: #include "bufaux.h"
1.123 markus 61: #include "channels.h"
1.49 markus 62: #include "key.h"
1.58 markus 63: #include "authfd.h"
1.49 markus 64: #include "authfile.h"
1.83 markus 65: #include "pathnames.h"
1.214 djm 66: #include "dispatch.h"
1.81 markus 67: #include "clientloop.h"
1.84 markus 68: #include "log.h"
69: #include "readconf.h"
70: #include "sshconnect.h"
71: #include "misc.h"
1.95 markus 72: #include "kex.h"
73: #include "mac.h"
1.213 deraadt 74: #include "sshpty.h"
1.212 djm 75: #include "match.h"
1.214 djm 76: #include "msg.h"
77: #include "monitor_fdpass.h"
1.225 dtucker 78: #include "uidswap.h"
1.49 markus 79:
1.127 markus 80: #ifdef SMARTCARD
81: #include "scard.h"
1.137 jakob 82: #endif
1.127 markus 83:
1.49 markus 84: extern char *__progname;
1.1 deraadt 85:
1.31 markus 86: /* Flag indicating whether debug mode is on. This can be set on the command line. */
1.1 deraadt 87: int debug_flag = 0;
88:
1.46 markus 89: /* Flag indicating whether a tty should be allocated */
1.1 deraadt 90: int tty_flag = 0;
1.79 markus 91: int no_tty_flag = 0;
92: int force_tty_flag = 0;
1.1 deraadt 93:
1.45 markus 94: /* don't exec a shell */
95: int no_shell_flag = 0;
96:
1.33 markus 97: /*
98: * Flag indicating that nothing should be read from stdin. This can be set
99: * on the command line.
100: */
1.1 deraadt 101: int stdin_null_flag = 0;
102:
1.33 markus 103: /*
104: * Flag indicating that ssh should fork after authentication. This is useful
1.172 deraadt 105: * so that the passphrase can be entered manually, and then ssh goes to the
1.33 markus 106: * background.
107: */
1.1 deraadt 108: int fork_after_authentication_flag = 0;
109:
1.33 markus 110: /*
111: * General data structure for command line options and options configurable
112: * in configuration files. See readconf.h.
113: */
1.1 deraadt 114: Options options;
115:
1.139 markus 116: /* optional user configfile */
117: char *config = NULL;
118:
1.33 markus 119: /*
120: * Name of the host we are connecting to. This is the name given on the
121: * command line, or the HostName specified for the user-supplied name in a
122: * configuration file.
123: */
1.1 deraadt 124: char *host;
125:
1.22 provos 126: /* socket address the host resolves to */
1.37 markus 127: struct sockaddr_storage hostaddr;
1.1 deraadt 128:
1.112 markus 129: /* Private host keys. */
1.173 markus 130: Sensitive sensitive_data;
1.1 deraadt 131:
1.10 dugsong 132: /* Original real UID. */
133: uid_t original_real_uid;
1.177 markus 134: uid_t original_effective_uid;
1.1 deraadt 135:
1.45 markus 136: /* command to be executed */
137: Buffer command;
138:
1.85 djm 139: /* Should we execute a command or invoke a subsystem? */
140: int subsystem_flag = 0;
141:
1.170 markus 142: /* # of replies received for global requests */
143: static int client_global_request_id = 0;
144:
1.186 djm 145: /* pid of proxycommand child process */
146: pid_t proxy_command_pid = 0;
147:
1.214 djm 148: /* fd to control socket */
149: int control_fd = -1;
150:
1.229 djm 151: /* Multiplexing control command */
1.240 djm 152: static u_int mux_command = 0;
1.229 djm 153:
1.214 djm 154: /* Only used in control client mode */
155: volatile sig_atomic_t control_client_terminate = 0;
156: u_int control_server_pid = 0;
157:
1.1 deraadt 158: /* Prints a help message to the user. This function never returns. */
159:
1.126 itojun 160: static void
1.93 itojun 161: usage(void)
1.1 deraadt 162: {
1.208 markus 163: fprintf(stderr,
1.230 jmc 164: "usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
1.251 jmc 165: " [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
1.233 jmc 166: " [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
1.232 djm 167: " [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
1.233 jmc 168: " [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
1.255 reyk 169: " [-w tunnel:tunnel] [user@]hostname [command]\n"
1.208 markus 170: );
1.257 dtucker 171: exit(255);
1.1 deraadt 172: }
173:
1.126 itojun 174: static int ssh_session(void);
175: static int ssh_session2(void);
176: static void load_public_identity_files(void);
1.214 djm 177: static void control_client(const char *path);
1.45 markus 178:
1.32 deraadt 179: /*
180: * Main program for the ssh client.
181: */
1.2 provos 182: int
183: main(int ac, char **av)
1.1 deraadt 184: {
1.178 markus 185: int i, opt, exit_status;
1.205 markus 186: char *p, *cp, *line, buf[256];
1.31 markus 187: struct stat st;
1.98 markus 188: struct passwd *pw;
1.45 markus 189: int dummy;
1.144 stevesk 190: extern int optind, optreset;
191: extern char *optarg;
1.244 djm 192: struct servent *sp;
1.232 djm 193: Forward fwd;
1.250 djm 194:
195: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
196: sanitise_stdfd();
1.31 markus 197:
1.33 markus 198: /*
199: * Save the original real uid. It will be needed later (uid-swapping
200: * may clobber the real uid).
201: */
1.31 markus 202: original_real_uid = getuid();
203: original_effective_uid = geteuid();
204:
1.184 stevesk 205: /*
206: * Use uid-swapping to give up root privileges for the duration of
207: * option processing. We will re-instantiate the rights when we are
208: * ready to create the privileged port, and will permanently drop
209: * them when the port has been created (actually, when the connection
210: * has been made, as we may need to create the port several times).
211: */
212: PRIV_END;
213:
1.31 markus 214: /* If we are installed setuid root be careful to not drop core. */
215: if (original_real_uid != original_effective_uid) {
216: struct rlimit rlim;
217: rlim.rlim_cur = rlim.rlim_max = 0;
218: if (setrlimit(RLIMIT_CORE, &rlim) < 0)
219: fatal("setrlimit failed: %.100s", strerror(errno));
1.1 deraadt 220: }
1.107 markus 221: /* Get user data. */
222: pw = getpwuid(original_real_uid);
223: if (!pw) {
1.191 itojun 224: logit("You don't exist, go away!");
1.257 dtucker 225: exit(255);
1.107 markus 226: }
227: /* Take a copy of the returned structure. */
228: pw = pwcopy(pw);
1.31 markus 229:
1.33 markus 230: /*
231: * Set our umask to something reasonable, as some files are created
232: * with the default umask. This will make them world-readable but
233: * writable only by the owner, which is ok for all files for which we
234: * don't set the modes explicitly.
235: */
1.31 markus 236: umask(022);
237:
238: /* Initialize option structure to indicate that no values have been set. */
239: initialize_options(&options);
240:
241: /* Parse command-line arguments. */
242: host = NULL;
243:
1.128 fgsch 244: again:
245: while ((opt = getopt(ac, av,
1.255 reyk 246: "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
1.31 markus 247: switch (opt) {
1.91 jakob 248: case '1':
249: options.protocol = SSH_PROTO_1;
250: break;
1.47 markus 251: case '2':
252: options.protocol = SSH_PROTO_2;
253: break;
1.37 markus 254: case '4':
1.196 djm 255: options.address_family = AF_INET;
1.37 markus 256: break;
257: case '6':
1.196 djm 258: options.address_family = AF_INET6;
1.37 markus 259: break;
1.31 markus 260: case 'n':
261: stdin_null_flag = 1;
262: break;
263: case 'f':
264: fork_after_authentication_flag = 1;
265: stdin_null_flag = 1;
266: break;
267: case 'x':
268: options.forward_x11 = 0;
269: break;
270: case 'X':
271: options.forward_x11 = 1;
272: break;
1.202 markus 273: case 'Y':
274: options.forward_x11 = 1;
275: options.forward_x11_trusted = 1;
276: break;
1.31 markus 277: case 'g':
278: options.gateway_ports = 1;
279: break;
1.229 djm 280: case 'O':
281: if (strcmp(optarg, "check") == 0)
282: mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
283: else if (strcmp(optarg, "exit") == 0)
284: mux_command = SSHMUX_COMMAND_TERMINATE;
285: else
286: fatal("Invalid multiplex command.");
287: break;
1.183 stevesk 288: case 'P': /* deprecated */
1.31 markus 289: options.use_privileged_port = 0;
290: break;
291: case 'a':
292: options.forward_agent = 0;
1.53 markus 293: break;
294: case 'A':
295: options.forward_agent = 1;
1.31 markus 296: break;
297: case 'k':
1.204 dtucker 298: options.gss_deleg_creds = 0;
1.31 markus 299: break;
300: case 'i':
301: if (stat(optarg, &st) < 0) {
1.128 fgsch 302: fprintf(stderr, "Warning: Identity file %s "
1.231 otto 303: "not accessible: %s.\n", optarg,
304: strerror(errno));
1.31 markus 305: break;
306: }
1.128 fgsch 307: if (options.num_identity_files >=
308: SSH_MAX_IDENTITY_FILES)
309: fatal("Too many identity files specified "
310: "(max %d)", SSH_MAX_IDENTITY_FILES);
311: options.identity_files[options.num_identity_files++] =
312: xstrdup(optarg);
1.31 markus 313: break;
1.127 markus 314: case 'I':
315: #ifdef SMARTCARD
1.133 markus 316: options.smartcard_device = xstrdup(optarg);
1.137 jakob 317: #else
1.127 markus 318: fprintf(stderr, "no support for smartcards.\n");
1.137 jakob 319: #endif
1.127 markus 320: break;
1.31 markus 321: case 't':
1.79 markus 322: if (tty_flag)
323: force_tty_flag = 1;
1.31 markus 324: tty_flag = 1;
325: break;
326: case 'v':
1.197 markus 327: if (debug_flag == 0) {
1.66 markus 328: debug_flag = 1;
329: options.log_level = SYSLOG_LEVEL_DEBUG1;
1.197 markus 330: } else {
331: if (options.log_level < SYSLOG_LEVEL_DEBUG3)
332: options.log_level++;
1.66 markus 333: break;
1.197 markus 334: }
1.227 deraadt 335: /* FALLTHROUGH */
1.31 markus 336: case 'V':
1.209 markus 337: fprintf(stderr, "%s, %s\n",
338: SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
1.31 markus 339: if (opt == 'V')
340: exit(0);
341: break;
1.255 reyk 342: case 'w':
1.256 reyk 343: if (options.tun_open == -1)
344: options.tun_open = SSH_TUNMODE_DEFAULT;
1.255 reyk 345: options.tun_local = a2tun(optarg, &options.tun_remote);
1.256 reyk 346: if (options.tun_local == SSH_TUNID_ERR) {
1.255 reyk 347: fprintf(stderr, "Bad tun device '%s'\n", optarg);
1.257 dtucker 348: exit(255);
1.255 reyk 349: }
350: break;
1.31 markus 351: case 'q':
352: options.log_level = SYSLOG_LEVEL_QUIET;
353: break;
354: case 'e':
355: if (optarg[0] == '^' && optarg[2] == 0 &&
1.128 fgsch 356: (u_char) optarg[1] >= 64 &&
357: (u_char) optarg[1] < 128)
1.78 markus 358: options.escape_char = (u_char) optarg[1] & 31;
1.31 markus 359: else if (strlen(optarg) == 1)
1.78 markus 360: options.escape_char = (u_char) optarg[0];
1.31 markus 361: else if (strcmp(optarg, "none") == 0)
1.119 stevesk 362: options.escape_char = SSH_ESCAPECHAR_NONE;
1.31 markus 363: else {
1.128 fgsch 364: fprintf(stderr, "Bad escape character '%s'.\n",
365: optarg);
1.257 dtucker 366: exit(255);
1.31 markus 367: }
368: break;
369: case 'c':
1.49 markus 370: if (ciphers_valid(optarg)) {
371: /* SSH2 only */
372: options.ciphers = xstrdup(optarg);
1.224 markus 373: options.cipher = SSH_CIPHER_INVALID;
1.49 markus 374: } else {
375: /* SSH1 only */
1.74 markus 376: options.cipher = cipher_number(optarg);
377: if (options.cipher == -1) {
1.128 fgsch 378: fprintf(stderr,
379: "Unknown cipher type '%s'\n",
380: optarg);
1.257 dtucker 381: exit(255);
1.49 markus 382: }
1.128 fgsch 383: if (options.cipher == SSH_CIPHER_3DES)
1.74 markus 384: options.ciphers = "3des-cbc";
1.128 fgsch 385: else if (options.cipher == SSH_CIPHER_BLOWFISH)
1.74 markus 386: options.ciphers = "blowfish-cbc";
1.128 fgsch 387: else
1.74 markus 388: options.ciphers = (char *)-1;
1.95 markus 389: }
390: break;
391: case 'm':
392: if (mac_valid(optarg))
393: options.macs = xstrdup(optarg);
394: else {
1.128 fgsch 395: fprintf(stderr, "Unknown mac type '%s'\n",
396: optarg);
1.257 dtucker 397: exit(255);
1.31 markus 398: }
399: break;
1.214 djm 400: case 'M':
1.242 djm 401: if (options.control_master == SSHCTL_MASTER_YES)
402: options.control_master = SSHCTL_MASTER_ASK;
403: else
404: options.control_master = SSHCTL_MASTER_YES;
1.214 djm 405: break;
1.31 markus 406: case 'p':
1.113 stevesk 407: options.port = a2port(optarg);
408: if (options.port == 0) {
1.109 markus 409: fprintf(stderr, "Bad port '%s'\n", optarg);
1.257 dtucker 410: exit(255);
1.109 markus 411: }
1.31 markus 412: break;
413: case 'l':
414: options.user = optarg;
415: break;
1.141 stevesk 416:
417: case 'L':
1.232 djm 418: if (parse_forward(&fwd, optarg))
419: add_local_forward(&options, &fwd);
420: else {
1.128 fgsch 421: fprintf(stderr,
1.232 djm 422: "Bad local forwarding specification '%s'\n",
1.128 fgsch 423: optarg);
1.257 dtucker 424: exit(255);
1.31 markus 425: }
1.232 djm 426: break;
427:
428: case 'R':
429: if (parse_forward(&fwd, optarg)) {
430: add_remote_forward(&options, &fwd);
431: } else {
1.128 fgsch 432: fprintf(stderr,
1.232 djm 433: "Bad remote forwarding specification "
434: "'%s'\n", optarg);
1.257 dtucker 435: exit(255);
1.31 markus 436: }
437: break;
1.108 markus 438:
439: case 'D':
1.232 djm 440: cp = p = xstrdup(optarg);
441: memset(&fwd, '\0', sizeof(fwd));
442: fwd.connect_host = "socks";
443: if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
444: fprintf(stderr, "Bad dynamic forwarding "
445: "specification '%.100s'\n", optarg);
1.257 dtucker 446: exit(255);
1.232 djm 447: }
448: if (cp != NULL) {
449: fwd.listen_port = a2port(cp);
450: fwd.listen_host = cleanhostname(fwd.listen_host);
451: } else {
452: fwd.listen_port = a2port(fwd.listen_host);
1.249 djm 453: fwd.listen_host = NULL;
1.232 djm 454: }
455:
456: if (fwd.listen_port == 0) {
1.128 fgsch 457: fprintf(stderr, "Bad dynamic port '%s'\n",
458: optarg);
1.257 dtucker 459: exit(255);
1.109 markus 460: }
1.232 djm 461: add_local_forward(&options, &fwd);
462: xfree(p);
1.108 markus 463: break;
464:
1.31 markus 465: case 'C':
466: options.compression = 1;
467: break;
1.45 markus 468: case 'N':
469: no_shell_flag = 1;
470: no_tty_flag = 1;
471: break;
472: case 'T':
473: no_tty_flag = 1;
474: break;
1.31 markus 475: case 'o':
476: dummy = 1;
1.205 markus 477: line = xstrdup(optarg);
1.128 fgsch 478: if (process_config_line(&options, host ? host : "",
1.205 markus 479: line, "command-line", 0, &dummy) != 0)
1.257 dtucker 480: exit(255);
1.205 markus 481: xfree(line);
1.31 markus 482: break;
1.85 djm 483: case 's':
484: subsystem_flag = 1;
1.117 markus 485: break;
1.214 djm 486: case 'S':
487: if (options.control_path != NULL)
488: free(options.control_path);
489: options.control_path = xstrdup(optarg);
490: break;
1.117 markus 491: case 'b':
492: options.bind_address = optarg;
1.85 djm 493: break;
1.139 markus 494: case 'F':
495: config = optarg;
496: break;
1.31 markus 497: default:
498: usage();
1.1 deraadt 499: }
1.31 markus 500: }
501:
1.128 fgsch 502: ac -= optind;
503: av += optind;
504:
505: if (ac > 0 && !host && **av != '-') {
1.188 markus 506: if (strrchr(*av, '@')) {
1.128 fgsch 507: p = xstrdup(*av);
1.188 markus 508: cp = strrchr(p, '@');
1.128 fgsch 509: if (cp == NULL || cp == p)
510: usage();
511: options.user = p;
512: *cp = '\0';
513: host = ++cp;
514: } else
515: host = *av;
1.189 millert 516: if (ac > 1) {
517: optind = optreset = 1;
1.128 fgsch 518: goto again;
519: }
1.189 millert 520: ac--, av++;
1.128 fgsch 521: }
522:
1.31 markus 523: /* Check that we got a host name. */
524: if (!host)
525: usage();
526:
1.54 markus 527: SSLeay_add_all_algorithms();
1.72 markus 528: ERR_load_crypto_strings();
1.31 markus 529:
530: /* Initialize the command to execute on remote host. */
531: buffer_init(&command);
1.1 deraadt 532:
1.33 markus 533: /*
534: * Save the command to execute on the remote host in a buffer. There
535: * is no limit on the length of the command, except by the maximum
536: * packet size. Also sets the tty flag if there is no command.
537: */
1.128 fgsch 538: if (!ac) {
1.31 markus 539: /* No command specified - execute shell on a tty. */
540: tty_flag = 1;
1.85 djm 541: if (subsystem_flag) {
1.128 fgsch 542: fprintf(stderr,
543: "You must specify a subsystem to invoke.\n");
1.85 djm 544: usage();
545: }
1.31 markus 546: } else {
1.128 fgsch 547: /* A command has been specified. Store it into the buffer. */
548: for (i = 0; i < ac; i++) {
549: if (i)
1.31 markus 550: buffer_append(&command, " ", 1);
551: buffer_append(&command, av[i], strlen(av[i]));
552: }
553: }
554:
555: /* Cannot fork to background if no command. */
1.63 markus 556: if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
1.31 markus 557: fatal("Cannot fork into background without a command to execute.");
558:
559: /* Allocate a tty by default if no command specified. */
560: if (buffer_len(&command) == 0)
561: tty_flag = 1;
562:
1.180 deraadt 563: /* Force no tty */
1.75 markus 564: if (no_tty_flag)
565: tty_flag = 0;
1.31 markus 566: /* Do not allocate a tty if stdin is not a tty. */
1.236 djm 567: if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
1.31 markus 568: if (tty_flag)
1.191 itojun 569: logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
1.31 markus 570: tty_flag = 0;
571: }
1.45 markus 572:
1.101 markus 573: /*
574: * Initialize "log" output. Since we are the client all output
575: * actually goes to stderr.
576: */
1.111 markus 577: log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
578: SYSLOG_FACILITY_USER, 1);
1.31 markus 579:
1.139 markus 580: /*
581: * Read per-user configuration file. Ignore the system wide config
582: * file if the user specifies a config file on the command line.
583: */
584: if (config != NULL) {
1.211 djm 585: if (!read_config_file(config, host, &options, 0))
1.142 stevesk 586: fatal("Can't open user config file %.100s: "
587: "%.100s", config, strerror(errno));
1.139 markus 588: } else {
589: snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
590: _PATH_SSH_USER_CONFFILE);
1.210 djm 591: (void)read_config_file(buf, host, &options, 1);
1.139 markus 592:
1.145 markus 593: /* Read systemwide configuration file after use config. */
1.223 deraadt 594: (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
1.210 djm 595: &options, 0);
1.139 markus 596: }
1.31 markus 597:
598: /* Fill configuration defaults. */
599: fill_default_options(&options);
600:
1.196 djm 601: channel_set_af(options.address_family);
602:
1.31 markus 603: /* reinit */
1.101 markus 604: log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
1.31 markus 605:
606: if (options.user == NULL)
607: options.user = xstrdup(pw->pw_name);
608:
609: if (options.hostname != NULL)
610: host = options.hostname;
1.195 markus 611:
612: /* force lowercase for hostkey matching */
613: if (options.host_key_alias != NULL) {
614: for (p = options.host_key_alias; *p; p++)
615: if (isupper(*p))
616: *p = tolower(*p);
617: }
1.190 markus 618:
1.246 djm 619: /* Get default port if port has not been set. */
620: if (options.port == 0) {
621: sp = getservbyname(SSH_SERVICE_NAME, "tcp");
622: options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
623: }
624:
1.190 markus 625: if (options.proxy_command != NULL &&
626: strcmp(options.proxy_command, "none") == 0)
627: options.proxy_command = NULL;
1.245 djm 628: if (options.control_path != NULL &&
629: strcmp(options.control_path, "none") == 0)
630: options.control_path = NULL;
1.31 markus 631:
1.214 djm 632: if (options.control_path != NULL) {
1.241 djm 633: snprintf(buf, sizeof(buf), "%d", options.port);
634: cp = tilde_expand_filename(options.control_path,
635: original_real_uid);
636: options.control_path = percent_expand(cp, "p", buf, "h", host,
637: "r", options.user, (char *)NULL);
638: xfree(cp);
1.214 djm 639: }
1.240 djm 640: if (mux_command != 0 && options.control_path == NULL)
641: fatal("No ControlPath specified for \"-O\" command");
1.242 djm 642: if (options.control_path != NULL)
1.237 jakob 643: control_client(options.control_path);
1.214 djm 644:
1.77 markus 645: /* Open a connection to the remote host. */
1.203 djm 646: if (ssh_connect(host, &hostaddr, options.port,
1.196 djm 647: options.address_family, options.connection_attempts,
1.177 markus 648: original_effective_uid == 0 && options.use_privileged_port,
1.179 markus 649: options.proxy_command) != 0)
1.257 dtucker 650: exit(255);
1.31 markus 651:
1.33 markus 652: /*
653: * If we successfully made the connection, load the host private key
654: * in case we will need it later for combined rsa-rhosts
655: * authentication. This must be done before releasing extra
656: * privileges, because the file is only readable by root.
1.174 markus 657: * If we cannot access the private keys, load the public keys
658: * instead and try to execute the ssh-keysign helper instead.
1.33 markus 659: */
1.112 markus 660: sensitive_data.nkeys = 0;
661: sensitive_data.keys = NULL;
1.173 markus 662: sensitive_data.external_keysign = 0;
1.178 markus 663: if (options.rhosts_rsa_authentication ||
664: options.hostbased_authentication) {
1.112 markus 665: sensitive_data.nkeys = 3;
1.180 deraadt 666: sensitive_data.keys = xmalloc(sensitive_data.nkeys *
667: sizeof(Key));
1.177 markus 668:
669: PRIV_START;
1.112 markus 670: sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
1.105 markus 671: _PATH_HOST_KEY_FILE, "", NULL);
1.112 markus 672: sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
673: _PATH_HOST_DSA_KEY_FILE, "", NULL);
674: sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
675: _PATH_HOST_RSA_KEY_FILE, "", NULL);
1.177 markus 676: PRIV_END;
1.173 markus 677:
1.181 markus 678: if (options.hostbased_authentication == 1 &&
679: sensitive_data.keys[0] == NULL &&
1.173 markus 680: sensitive_data.keys[1] == NULL &&
681: sensitive_data.keys[2] == NULL) {
682: sensitive_data.keys[1] = key_load_public(
683: _PATH_HOST_DSA_KEY_FILE, NULL);
684: sensitive_data.keys[2] = key_load_public(
685: _PATH_HOST_RSA_KEY_FILE, NULL);
686: sensitive_data.external_keysign = 1;
687: }
1.31 markus 688: }
1.33 markus 689: /*
690: * Get rid of any extra privileges that we may have. We will no
691: * longer need them. Also, extra privileges could make it very hard
692: * to read identity files and other non-world-readable files from the
693: * user's home directory if it happens to be on a NFS volume where
694: * root is mapped to nobody.
695: */
1.225 dtucker 696: if (original_effective_uid == 0) {
697: PRIV_START;
698: permanently_set_uid(pw);
699: }
1.31 markus 700:
1.33 markus 701: /*
702: * Now that we are back to our own permissions, create ~/.ssh
1.254 djm 703: * directory if it doesn't already exist.
1.33 markus 704: */
1.138 jakob 705: snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
1.31 markus 706: if (stat(buf, &st) < 0)
1.57 djm 707: if (mkdir(buf, 0700) < 0)
1.31 markus 708: error("Could not create directory '%.200s'.", buf);
709:
1.104 markus 710: /* load options.identity_files */
711: load_public_identity_files();
712:
713: /* Expand ~ in known host file names. */
714: /* XXX mem-leaks: */
1.72 markus 715: options.system_hostfile =
716: tilde_expand_filename(options.system_hostfile, original_real_uid);
717: options.user_hostfile =
718: tilde_expand_filename(options.user_hostfile, original_real_uid);
719: options.system_hostfile2 =
720: tilde_expand_filename(options.system_hostfile2, original_real_uid);
721: options.user_hostfile2 =
722: tilde_expand_filename(options.user_hostfile2, original_real_uid);
1.149 markus 723:
724: signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
1.31 markus 725:
726: /* Log into the remote system. This never returns if the login fails. */
1.173 markus 727: ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
1.31 markus 728:
1.112 markus 729: /* We no longer need the private host keys. Clear them now. */
730: if (sensitive_data.nkeys != 0) {
731: for (i = 0; i < sensitive_data.nkeys; i++) {
732: if (sensitive_data.keys[i] != NULL) {
733: /* Destroys contents safely */
734: debug3("clear hostkey %d", i);
735: key_free(sensitive_data.keys[i]);
736: sensitive_data.keys[i] = NULL;
737: }
738: }
739: xfree(sensitive_data.keys);
1.134 markus 740: }
741: for (i = 0; i < options.num_identity_files; i++) {
742: if (options.identity_files[i]) {
743: xfree(options.identity_files[i]);
744: options.identity_files[i] = NULL;
745: }
746: if (options.identity_keys[i]) {
747: key_free(options.identity_keys[i]);
748: options.identity_keys[i] = NULL;
749: }
1.112 markus 750: }
1.31 markus 751:
1.45 markus 752: exit_status = compat20 ? ssh_session2() : ssh_session();
753: packet_close();
1.186 djm 754:
1.214 djm 755: if (options.control_path != NULL && control_fd != -1)
756: unlink(options.control_path);
757:
1.186 djm 758: /*
1.203 djm 759: * Send SIGHUP to proxy command if used. We don't wait() in
1.186 djm 760: * case it hangs and instead rely on init to reap the child
761: */
762: if (proxy_command_pid > 1)
763: kill(proxy_command_pid, SIGHUP);
764:
1.45 markus 765: return exit_status;
766: }
767:
1.126 itojun 768: static void
1.70 markus 769: ssh_init_forwarding(void)
770: {
1.86 markus 771: int success = 0;
1.70 markus 772: int i;
1.86 markus 773:
1.70 markus 774: /* Initiate local TCP/IP port forwardings. */
775: for (i = 0; i < options.num_local_forwards; i++) {
1.232 djm 776: debug("Local connections to %.200s:%d forwarded to remote "
777: "address %.200s:%d",
1.234 deraadt 778: (options.local_forwards[i].listen_host == NULL) ?
779: (options.gateway_ports ? "*" : "LOCALHOST") :
1.232 djm 780: options.local_forwards[i].listen_host,
781: options.local_forwards[i].listen_port,
782: options.local_forwards[i].connect_host,
783: options.local_forwards[i].connect_port);
1.158 markus 784: success += channel_setup_local_fwd_listener(
1.232 djm 785: options.local_forwards[i].listen_host,
786: options.local_forwards[i].listen_port,
787: options.local_forwards[i].connect_host,
788: options.local_forwards[i].connect_port,
1.70 markus 789: options.gateway_ports);
790: }
1.86 markus 791: if (i > 0 && success == 0)
792: error("Could not request local forwarding.");
1.70 markus 793:
794: /* Initiate remote TCP/IP port forwardings. */
795: for (i = 0; i < options.num_remote_forwards; i++) {
1.232 djm 796: debug("Remote connections from %.200s:%d forwarded to "
797: "local address %.200s:%d",
1.248 djm 798: (options.remote_forwards[i].listen_host == NULL) ?
1.253 djm 799: "LOCALHOST" : options.remote_forwards[i].listen_host,
1.232 djm 800: options.remote_forwards[i].listen_port,
801: options.remote_forwards[i].connect_host,
802: options.remote_forwards[i].connect_port);
1.70 markus 803: channel_request_remote_forwarding(
1.232 djm 804: options.remote_forwards[i].listen_host,
805: options.remote_forwards[i].listen_port,
806: options.remote_forwards[i].connect_host,
807: options.remote_forwards[i].connect_port);
1.70 markus 808: }
809: }
810:
1.126 itojun 811: static void
1.70 markus 812: check_agent_present(void)
813: {
814: if (options.forward_agent) {
1.254 djm 815: /* Clear agent forwarding if we don't have an agent. */
1.185 stevesk 816: if (!ssh_agent_present())
1.70 markus 817: options.forward_agent = 0;
818: }
819: }
820:
1.126 itojun 821: static int
1.45 markus 822: ssh_session(void)
823: {
824: int type;
825: int interactive = 0;
826: int have_tty = 0;
827: struct winsize ws;
828: char *cp;
1.243 djm 829: const char *display;
1.45 markus 830:
1.31 markus 831: /* Enable compression if requested. */
832: if (options.compression) {
833: debug("Requesting compression at level %d.", options.compression_level);
834:
835: if (options.compression_level < 1 || options.compression_level > 9)
836: fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
837:
838: /* Send the request. */
839: packet_start(SSH_CMSG_REQUEST_COMPRESSION);
840: packet_put_int(options.compression_level);
841: packet_send();
842: packet_write_wait();
1.156 markus 843: type = packet_read();
1.31 markus 844: if (type == SSH_SMSG_SUCCESS)
845: packet_start_compression(options.compression_level);
846: else if (type == SSH_SMSG_FAILURE)
1.191 itojun 847: logit("Warning: Remote host refused compression.");
1.31 markus 848: else
849: packet_disconnect("Protocol error waiting for compression response.");
850: }
851: /* Allocate a pseudo tty if appropriate. */
852: if (tty_flag) {
853: debug("Requesting pty.");
854:
855: /* Start the packet. */
856: packet_start(SSH_CMSG_REQUEST_PTY);
857:
858: /* Store TERM in the packet. There is no limit on the
859: length of the string. */
860: cp = getenv("TERM");
861: if (!cp)
862: cp = "";
1.124 markus 863: packet_put_cstring(cp);
1.31 markus 864:
865: /* Store window size in the packet. */
866: if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
867: memset(&ws, 0, sizeof(ws));
868: packet_put_int(ws.ws_row);
869: packet_put_int(ws.ws_col);
870: packet_put_int(ws.ws_xpixel);
871: packet_put_int(ws.ws_ypixel);
872:
873: /* Store tty modes in the packet. */
1.115 stevesk 874: tty_make_modes(fileno(stdin), NULL);
1.31 markus 875:
876: /* Send the packet, and wait for it to leave. */
877: packet_send();
878: packet_write_wait();
879:
880: /* Read response from the server. */
1.156 markus 881: type = packet_read();
1.43 markus 882: if (type == SSH_SMSG_SUCCESS) {
1.31 markus 883: interactive = 1;
1.45 markus 884: have_tty = 1;
1.43 markus 885: } else if (type == SSH_SMSG_FAILURE)
1.191 itojun 886: logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
1.31 markus 887: else
888: packet_disconnect("Protocol error waiting for pty request response.");
889: }
890: /* Request X11 forwarding if enabled and DISPLAY is set. */
1.243 djm 891: display = getenv("DISPLAY");
892: if (options.forward_x11 && display != NULL) {
1.150 stevesk 893: char *proto, *data;
1.50 markus 894: /* Get reasonable local authentication information. */
1.243 djm 895: client_x11_get_proto(display, options.xauth_location,
896: options.forward_x11_trusted, &proto, &data);
1.50 markus 897: /* Request forwarding with authentication spoofing. */
1.31 markus 898: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 899: x11_request_forwarding_with_spoofing(0, display, proto, data);
1.31 markus 900:
901: /* Read response from the server. */
1.156 markus 902: type = packet_read();
1.31 markus 903: if (type == SSH_SMSG_SUCCESS) {
904: interactive = 1;
1.50 markus 905: } else if (type == SSH_SMSG_FAILURE) {
1.191 itojun 906: logit("Warning: Remote host denied X11 forwarding.");
1.50 markus 907: } else {
1.31 markus 908: packet_disconnect("Protocol error waiting for X11 forwarding");
1.50 markus 909: }
1.31 markus 910: }
911: /* Tell the packet module whether this is an interactive session. */
1.80 markus 912: packet_set_interactive(interactive);
1.31 markus 913:
914: /* Request authentication agent forwarding if appropriate. */
1.70 markus 915: check_agent_present();
916:
1.31 markus 917: if (options.forward_agent) {
918: debug("Requesting authentication agent forwarding.");
919: auth_request_forwarding();
920:
921: /* Read response from the server. */
1.156 markus 922: type = packet_read();
1.155 markus 923: packet_check_eom();
1.31 markus 924: if (type != SSH_SMSG_SUCCESS)
1.191 itojun 925: logit("Warning: Remote host denied authentication agent forwarding.");
1.31 markus 926: }
927:
1.70 markus 928: /* Initiate port forwardings. */
929: ssh_init_forwarding();
1.34 markus 930:
931: /* If requested, let ssh continue in the background. */
1.48 markus 932: if (fork_after_authentication_flag)
1.34 markus 933: if (daemon(1, 1) < 0)
934: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 935:
1.33 markus 936: /*
937: * If a command was specified on the command line, execute the
938: * command now. Otherwise request the server to start a shell.
939: */
1.31 markus 940: if (buffer_len(&command) > 0) {
941: int len = buffer_len(&command);
942: if (len > 900)
943: len = 900;
1.152 stevesk 944: debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
1.31 markus 945: packet_start(SSH_CMSG_EXEC_CMD);
946: packet_put_string(buffer_ptr(&command), buffer_len(&command));
947: packet_send();
948: packet_write_wait();
949: } else {
950: debug("Requesting shell.");
951: packet_start(SSH_CMSG_EXEC_SHELL);
952: packet_send();
953: packet_write_wait();
954: }
955:
956: /* Enter the interactive session. */
1.119 stevesk 957: return client_loop(have_tty, tty_flag ?
958: options.escape_char : SSH_ESCAPECHAR_NONE, 0);
1.45 markus 959: }
960:
1.126 itojun 961: static void
1.214 djm 962: ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
1.89 markus 963: {
964: int id, len;
965:
966: id = packet_get_int();
967: len = buffer_len(&command);
1.100 markus 968: if (len > 900)
969: len = 900;
1.155 markus 970: packet_check_eom();
1.89 markus 971: if (type == SSH2_MSG_CHANNEL_FAILURE)
972: fatal("Request for subsystem '%.*s' failed on channel %d",
1.152 stevesk 973: len, (u_char *)buffer_ptr(&command), id);
1.170 markus 974: }
975:
976: void
1.206 markus 977: client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
1.170 markus 978: {
979: int i;
980:
981: i = client_global_request_id++;
1.206 markus 982: if (i >= options.num_remote_forwards)
1.170 markus 983: return;
984: debug("remote forward %s for: listen %d, connect %s:%d",
985: type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
1.232 djm 986: options.remote_forwards[i].listen_port,
987: options.remote_forwards[i].connect_host,
988: options.remote_forwards[i].connect_port);
1.170 markus 989: if (type == SSH2_MSG_REQUEST_FAILURE)
1.232 djm 990: logit("Warning: remote port forwarding failed for listen "
991: "port %d", options.remote_forwards[i].listen_port);
1.89 markus 992: }
993:
1.126 itojun 994: static void
1.214 djm 995: ssh_control_listener(void)
1.45 markus 996: {
1.214 djm 997: struct sockaddr_un addr;
998: mode_t old_umask;
1.223 deraadt 999:
1.242 djm 1000: if (options.control_path == NULL ||
1001: options.control_master == SSHCTL_MASTER_NO)
1.214 djm 1002: return;
1003:
1.242 djm 1004: debug("setting up multiplex master socket");
1005:
1.214 djm 1006: memset(&addr, '\0', sizeof(addr));
1007: addr.sun_family = AF_UNIX;
1008: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1009: strlen(options.control_path) + 1;
1010:
1011: if (strlcpy(addr.sun_path, options.control_path,
1012: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1013: fatal("ControlPath too long");
1014:
1015: if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1.252 stevesk 1016: fatal("%s socket(): %s", __func__, strerror(errno));
1.214 djm 1017:
1018: old_umask = umask(0177);
1019: if (bind(control_fd, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1020: control_fd = -1;
1.238 djm 1021: if (errno == EINVAL || errno == EADDRINUSE)
1.214 djm 1022: fatal("ControlSocket %s already exists",
1023: options.control_path);
1024: else
1.252 stevesk 1025: fatal("%s bind(): %s", __func__, strerror(errno));
1.214 djm 1026: }
1027: umask(old_umask);
1.80 markus 1028:
1.214 djm 1029: if (listen(control_fd, 64) == -1)
1.252 stevesk 1030: fatal("%s listen(): %s", __func__, strerror(errno));
1.31 markus 1031:
1.214 djm 1032: set_nonblock(control_fd);
1033: }
1.45 markus 1034:
1.214 djm 1035: /* request pty/x11/agent/tcpfwd/shell for channel */
1036: static void
1037: ssh_session2_setup(int id, void *arg)
1038: {
1.215 djm 1039: extern char **environ;
1.243 djm 1040: const char *display;
1041: int interactive = tty_flag;
1.215 djm 1042:
1.248 djm 1043: display = getenv("DISPLAY");
1.243 djm 1044: if (options.forward_x11 && display != NULL) {
1.150 stevesk 1045: char *proto, *data;
1.50 markus 1046: /* Get reasonable local authentication information. */
1.243 djm 1047: client_x11_get_proto(display, options.xauth_location,
1048: options.forward_x11_trusted, &proto, &data);
1.50 markus 1049: /* Request forwarding with authentication spoofing. */
1050: debug("Requesting X11 forwarding with authentication spoofing.");
1.243 djm 1051: x11_request_forwarding_with_spoofing(id, display, proto, data);
1.80 markus 1052: interactive = 1;
1.50 markus 1053: /* XXX wait for reply */
1054: }
1055:
1.70 markus 1056: check_agent_present();
1057: if (options.forward_agent) {
1058: debug("Requesting authentication agent forwarding.");
1059: channel_request_start(id, "auth-agent-req@openssh.com", 0);
1060: packet_send();
1.212 djm 1061: }
1062:
1.256 reyk 1063: if (options.tun_open != SSH_TUNMODE_NO) {
1.255 reyk 1064: Channel *c;
1065: int fd;
1066:
1067: debug("Requesting tun.");
1.256 reyk 1068: if ((fd = tun_open(options.tun_local,
1069: options.tun_open)) >= 0) {
1.255 reyk 1070: c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
1071: CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1072: 0, "tun", 1);
1073: c->datagram = 1;
1074: packet_start(SSH2_MSG_CHANNEL_OPEN);
1075: packet_put_cstring("tun@openssh.com");
1076: packet_put_int(c->self);
1077: packet_put_int(c->local_window_max);
1078: packet_put_int(c->local_maxpacket);
1.256 reyk 1079: packet_put_int(options.tun_open);
1.255 reyk 1080: packet_put_int(options.tun_remote);
1081: packet_send();
1082: }
1083: }
1084:
1.214 djm 1085: client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
1.215 djm 1086: NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
1.90 markus 1087:
1.80 markus 1088: packet_set_interactive(interactive);
1.45 markus 1089: }
1090:
1.143 markus 1091: /* open new channel for a session */
1.126 itojun 1092: static int
1.143 markus 1093: ssh_session2_open(void)
1.45 markus 1094: {
1.118 markus 1095: Channel *c;
1096: int window, packetmax, in, out, err;
1.60 markus 1097:
1.62 markus 1098: if (stdin_null_flag) {
1.93 itojun 1099: in = open(_PATH_DEVNULL, O_RDONLY);
1.62 markus 1100: } else {
1101: in = dup(STDIN_FILENO);
1102: }
1.60 markus 1103: out = dup(STDOUT_FILENO);
1104: err = dup(STDERR_FILENO);
1.45 markus 1105:
1106: if (in < 0 || out < 0 || err < 0)
1.62 markus 1107: fatal("dup() in/out/err failed");
1.45 markus 1108:
1.69 markus 1109: /* enable nonblocking unless tty */
1110: if (!isatty(in))
1111: set_nonblock(in);
1112: if (!isatty(out))
1113: set_nonblock(out);
1114: if (!isatty(err))
1115: set_nonblock(err);
1116:
1.65 markus 1117: window = CHAN_SES_WINDOW_DEFAULT;
1118: packetmax = CHAN_SES_PACKET_DEFAULT;
1.164 markus 1119: if (tty_flag) {
1120: window >>= 1;
1121: packetmax >>= 1;
1.45 markus 1122: }
1.118 markus 1123: c = channel_new(
1.45 markus 1124: "session", SSH_CHANNEL_OPENING, in, out, err,
1.65 markus 1125: window, packetmax, CHAN_EXTENDED_WRITE,
1.192 markus 1126: "client-session", /*nonblock*/0);
1.45 markus 1127:
1.143 markus 1128: debug3("ssh_session2_open: channel_new: %d", c->self);
1.106 markus 1129:
1.122 markus 1130: channel_send_open(c->self);
1.143 markus 1131: if (!no_shell_flag)
1.214 djm 1132: channel_register_confirm(c->self, ssh_session2_setup, NULL);
1.106 markus 1133:
1.118 markus 1134: return c->self;
1.106 markus 1135: }
1136:
1.126 itojun 1137: static int
1.106 markus 1138: ssh_session2(void)
1139: {
1.143 markus 1140: int id = -1;
1.106 markus 1141:
1142: /* XXX should be pre-session */
1143: ssh_init_forwarding();
1.214 djm 1144: ssh_control_listener();
1.106 markus 1145:
1.143 markus 1146: if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
1147: id = ssh_session2_open();
1.255 reyk 1148:
1149: /* Execute a local command */
1150: if (options.local_command != NULL &&
1151: options.permit_local_command)
1152: ssh_local_cmd(options.local_command);
1.106 markus 1153:
1154: /* If requested, let ssh continue in the background. */
1155: if (fork_after_authentication_flag)
1156: if (daemon(1, 1) < 0)
1157: fatal("daemon() failed: %.200s", strerror(errno));
1.31 markus 1158:
1.119 stevesk 1159: return client_loop(tty_flag, tty_flag ?
1160: options.escape_char : SSH_ESCAPECHAR_NONE, id);
1.72 markus 1161: }
1162:
1.126 itojun 1163: static void
1.104 markus 1164: load_public_identity_files(void)
1165: {
1166: char *filename;
1.167 markus 1167: int i = 0;
1.104 markus 1168: Key *public;
1.167 markus 1169: #ifdef SMARTCARD
1170: Key **keys;
1.104 markus 1171:
1.133 markus 1172: if (options.smartcard_device != NULL &&
1.167 markus 1173: options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
1174: (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
1175: int count = 0;
1176: for (i = 0; keys[i] != NULL; i++) {
1177: count++;
1178: memmove(&options.identity_files[1], &options.identity_files[0],
1179: sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
1180: memmove(&options.identity_keys[1], &options.identity_keys[0],
1181: sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
1182: options.num_identity_files++;
1183: options.identity_keys[0] = keys[i];
1.194 markus 1184: options.identity_files[0] = sc_get_key_label(keys[i]);
1.167 markus 1185: }
1.168 markus 1186: if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
1187: options.num_identity_files = SSH_MAX_IDENTITY_FILES;
1.167 markus 1188: i = count;
1189: xfree(keys);
1.127 markus 1190: }
1.136 jakob 1191: #endif /* SMARTCARD */
1.131 millert 1192: for (; i < options.num_identity_files; i++) {
1193: filename = tilde_expand_filename(options.identity_files[i],
1194: original_real_uid);
1195: public = key_load_public(filename, NULL);
1196: debug("identity file %s type %d", filename,
1197: public ? public->type : -1);
1198: xfree(options.identity_files[i]);
1199: options.identity_files[i] = filename;
1200: options.identity_keys[i] = public;
1201: }
1.214 djm 1202: }
1203:
1204: static void
1205: control_client_sighandler(int signo)
1206: {
1207: control_client_terminate = signo;
1208: }
1209:
1210: static void
1211: control_client_sigrelay(int signo)
1212: {
1213: if (control_server_pid > 1)
1214: kill(control_server_pid, signo);
1215: }
1216:
1.220 djm 1217: static int
1218: env_permitted(char *env)
1219: {
1220: int i;
1221: char name[1024], *cp;
1222:
1223: strlcpy(name, env, sizeof(name));
1224: if ((cp = strchr(name, '=')) == NULL)
1225: return (0);
1226:
1227: *cp = '\0';
1228:
1229: for (i = 0; i < options.num_send_env; i++)
1230: if (match_pattern(name, options.send_env[i]))
1231: return (1);
1232:
1233: return (0);
1234: }
1235:
1.214 djm 1236: static void
1237: control_client(const char *path)
1238: {
1239: struct sockaddr_un addr;
1.228 djm 1240: int i, r, fd, sock, exitval, num_env;
1.214 djm 1241: Buffer m;
1.229 djm 1242: char *term;
1.215 djm 1243: extern char **environ;
1.229 djm 1244: u_int flags;
1.242 djm 1245:
1246: if (mux_command == 0)
1247: mux_command = SSHMUX_COMMAND_OPEN;
1248:
1249: switch (options.control_master) {
1250: case SSHCTL_MASTER_AUTO:
1251: case SSHCTL_MASTER_AUTO_ASK:
1252: debug("auto-mux: Trying existing master");
1253: /* FALLTHROUGH */
1254: case SSHCTL_MASTER_NO:
1255: break;
1256: default:
1257: return;
1258: }
1.228 djm 1259:
1.214 djm 1260: memset(&addr, '\0', sizeof(addr));
1261: addr.sun_family = AF_UNIX;
1262: addr.sun_len = offsetof(struct sockaddr_un, sun_path) +
1263: strlen(path) + 1;
1264:
1265: if (strlcpy(addr.sun_path, path,
1266: sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
1267: fatal("ControlPath too long");
1268:
1269: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
1270: fatal("%s socket(): %s", __func__, strerror(errno));
1271:
1.237 jakob 1272: if (connect(sock, (struct sockaddr*)&addr, addr.sun_len) == -1) {
1.240 djm 1273: if (mux_command != SSHMUX_COMMAND_OPEN) {
1274: fatal("Control socket connect(%.100s): %s", path,
1275: strerror(errno));
1276: }
1.239 djm 1277: if (errno == ENOENT)
1278: debug("Control socket \"%.100s\" does not exist", path);
1279: else {
1280: error("Control socket connect(%.100s): %s", path,
1281: strerror(errno));
1282: }
1.237 jakob 1283: close(sock);
1284: return;
1285: }
1.248 djm 1286:
1.237 jakob 1287: if (stdin_null_flag) {
1288: if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
1289: fatal("open(/dev/null): %s", strerror(errno));
1290: if (dup2(fd, STDIN_FILENO) == -1)
1291: fatal("dup2: %s", strerror(errno));
1292: if (fd > STDERR_FILENO)
1293: close(fd);
1294: }
1.248 djm 1295:
1.247 djm 1296: term = getenv("TERM");
1.229 djm 1297:
1298: flags = 0;
1299: if (tty_flag)
1300: flags |= SSHMUX_FLAG_TTY;
1301: if (subsystem_flag)
1302: flags |= SSHMUX_FLAG_SUBSYS;
1.247 djm 1303: if (options.forward_x11)
1304: flags |= SSHMUX_FLAG_X11_FWD;
1305: if (options.forward_agent)
1306: flags |= SSHMUX_FLAG_AGENT_FWD;
1.214 djm 1307:
1308: buffer_init(&m);
1309:
1.229 djm 1310: /* Send our command to server */
1311: buffer_put_int(&m, mux_command);
1312: buffer_put_int(&m, flags);
1.247 djm 1313: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.229 djm 1314: fatal("%s: msg_send", __func__);
1315: buffer_clear(&m);
1316:
1317: /* Get authorisation status and PID of controlee */
1.214 djm 1318: if (ssh_msg_recv(sock, &m) == -1)
1319: fatal("%s: msg_recv", __func__);
1.247 djm 1320: if (buffer_get_char(&m) != SSHMUX_VER)
1.214 djm 1321: fatal("%s: wrong version", __func__);
1.216 djm 1322: if (buffer_get_int(&m) != 1)
1323: fatal("Connection to master denied");
1.214 djm 1324: control_server_pid = buffer_get_int(&m);
1325:
1326: buffer_clear(&m);
1327:
1.229 djm 1328: switch (mux_command) {
1329: case SSHMUX_COMMAND_ALIVE_CHECK:
1.234 deraadt 1330: fprintf(stderr, "Master running (pid=%d)\r\n",
1.229 djm 1331: control_server_pid);
1332: exit(0);
1333: case SSHMUX_COMMAND_TERMINATE:
1334: fprintf(stderr, "Exit request sent.\r\n");
1335: exit(0);
1336: case SSHMUX_COMMAND_OPEN:
1337: /* continue below */
1338: break;
1339: default:
1340: fatal("silly mux_command %d", mux_command);
1341: }
1342:
1343: /* SSHMUX_COMMAND_OPEN */
1.247 djm 1344: buffer_put_cstring(&m, term ? term : "");
1.214 djm 1345: buffer_append(&command, "\0", 1);
1346: buffer_put_cstring(&m, buffer_ptr(&command));
1.215 djm 1347:
1.220 djm 1348: if (options.num_send_env == 0 || environ == NULL) {
1349: buffer_put_int(&m, 0);
1.223 deraadt 1350: } else {
1.220 djm 1351: /* Pass environment */
1352: num_env = 0;
1353: for (i = 0; environ[i] != NULL; i++)
1354: if (env_permitted(environ[i]))
1355: num_env++; /* Count */
1.223 deraadt 1356:
1.220 djm 1357: buffer_put_int(&m, num_env);
1358:
1.222 dtucker 1359: for (i = 0; environ[i] != NULL && num_env >= 0; i++)
1360: if (env_permitted(environ[i])) {
1361: num_env--;
1.220 djm 1362: buffer_put_cstring(&m, environ[i]);
1.222 dtucker 1363: }
1.220 djm 1364: }
1.214 djm 1365:
1.247 djm 1366: if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
1.214 djm 1367: fatal("%s: msg_send", __func__);
1368:
1369: mm_send_fd(sock, STDIN_FILENO);
1370: mm_send_fd(sock, STDOUT_FILENO);
1371: mm_send_fd(sock, STDERR_FILENO);
1372:
1373: /* Wait for reply, so master has a chance to gather ttymodes */
1374: buffer_clear(&m);
1375: if (ssh_msg_recv(sock, &m) == -1)
1376: fatal("%s: msg_recv", __func__);
1.247 djm 1377: if (buffer_get_char(&m) != SSHMUX_VER)
1.229 djm 1378: fatal("%s: wrong version", __func__);
1.214 djm 1379: buffer_free(&m);
1.218 djm 1380:
1.226 djm 1381: signal(SIGHUP, control_client_sighandler);
1.218 djm 1382: signal(SIGINT, control_client_sighandler);
1383: signal(SIGTERM, control_client_sighandler);
1384: signal(SIGWINCH, control_client_sigrelay);
1.214 djm 1385:
1386: if (tty_flag)
1387: enter_raw_mode();
1388:
1389: /* Stick around until the controlee closes the client_fd */
1390: exitval = 0;
1391: for (;!control_client_terminate;) {
1392: r = read(sock, &exitval, sizeof(exitval));
1393: if (r == 0) {
1394: debug2("Received EOF from master");
1395: break;
1396: }
1397: if (r > 0)
1398: debug2("Received exit status from master %d", exitval);
1399: if (r == -1 && errno != EINTR)
1400: fatal("%s: read %s", __func__, strerror(errno));
1401: }
1402:
1403: if (control_client_terminate)
1404: debug2("Exiting on signal %d", control_client_terminate);
1405:
1406: close(sock);
1407:
1408: leave_raw_mode();
1409:
1410: if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
1411: fprintf(stderr, "Connection to master closed.\r\n");
1412:
1413: exit(exitval);
1.1 deraadt 1414: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh